THE PROTON is one of the simplest forms of subatomic particles of normal baryonic matter. “A proton is a subatomic particle, symbol p or p+, with a positive electric charge of +1e elementary charge and a mass slightly less than that of a neutron. Protons and neutrons, each with masses of approximately one atomic mass unit, are jointly referred to as “nucleons” (particles present in atomic nuclei).
https://en.m.wikipedia.org/wiki/Proton